// -*- C++ -*-
/*
 *
 * Template Numerical Toolkit (TNT): Two-dimensional Fortran numerical array
 *
 * Mathematical and Computational Sciences Division
 * National Institute of Technology,
 * Gaithersburg, MD USA
 *
 *
 * This software was developed at the National Institute of Standards and
 * Technology (NIST) by employees of the Federal Government in the course
 * of their official duties. Pursuant to title 17 Section 105 of the
 * United States Code, this software is not subject to copyright protection
 * and is in the public domain. NIST assumes no responsibility whatsoever for
 * its use by other parties, and makes no guarantees, expressed or implied,
 * about its quality, reliability, or any other characteristic.
 *
 */

#ifndef TNT_FORTRAN_ARRAY2D_H
#define TNT_FORTRAN_ARRAY2D_H

#include <cstdlib>
#include <iostream>

#ifdef TNT_BOUNDS_CHECK
#include <cassert>
#endif

#include "tnt/i_refvec.h"

namespace TNT {

template <class T> class Fortran_Array2D {

private:
  i_refvec<T> v_;
  int m_;
  int n_;
  T *data_;

  void initialize_(int n);
  void copy_(T *p, const T *q, int len);
  void set_(T *begin, T *end, const T &val);

public:
  typedef T value_type;

  Fortran_Array2D();
  Fortran_Array2D(int m, int n);
  Fortran_Array2D(int m, int n, T *a);
  Fortran_Array2D(int m, int n, const T &a);
  inline Fortran_Array2D(const Fortran_Array2D &A);
  inline Fortran_Array2D &operator=(const T &a);
  inline Fortran_Array2D &operator=(const Fortran_Array2D &A);
  inline Fortran_Array2D &ref(const Fortran_Array2D &A);
  Fortran_Array2D copy() const;
  Fortran_Array2D &inject(const Fortran_Array2D &A);
  inline T &operator()(int i, int j);
  inline const T &operator()(int i, int j) const;
  inline int dim1() const;
  inline int dim2() const;
  ~Fortran_Array2D();

  /* extended interface */

  inline int ref_count() const;
};

template <class T>
Fortran_Array2D<T>::Fortran_Array2D()
    : v_(), m_(0), n_(0), data_(0) {}

template <class T>
Fortran_Array2D<T>::Fortran_Array2D(const Fortran_Array2D<T> &A)
    : v_(A.v_), m_(A.m_), n_(A.n_), data_(A.data_) {}

template <class T>
Fortran_Array2D<T>::Fortran_Array2D(int m, int n)
    : v_(m * n), m_(m), n_(n), data_(v_.begin()) {}

template <class T>
Fortran_Array2D<T>::Fortran_Array2D(int m, int n, const T &val)
    : v_(m * n), m_(m), n_(n), data_(v_.begin()) {
  set_(data_, data_ + m * n, val);
}

template <class T>
Fortran_Array2D<T>::Fortran_Array2D(int m, int n, T *a)
    : v_(a), m_(m), n_(n), data_(v_.begin()) {}

template <class T> inline T &Fortran_Array2D<T>::operator()(int i, int j) {
#ifdef TNT_BOUNDS_CHECK
  assert(i >= 1);
  assert(i <= m_);
  assert(j >= 1);
  assert(j <= n_);
#endif

  return v_[(j - 1) * m_ + (i - 1)];
}

template <class T>
inline const T &Fortran_Array2D<T>::operator()(int i, int j) const {
#ifdef TNT_BOUNDS_CHECK
  assert(i >= 1);
  assert(i <= m_);
  assert(j >= 1);
  assert(j <= n_);
#endif

  return v_[(j - 1) * m_ + (i - 1)];
}

template <class T>
Fortran_Array2D<T> &Fortran_Array2D<T>::operator=(const T &a) {
  set_(data_, data_ + m_ * n_, a);
  return *this;
}

template <class T> Fortran_Array2D<T> Fortran_Array2D<T>::copy() const {

  Fortran_Array2D B(m_, n_);

  B.inject(*this);
  return B;
}

template <class T>
Fortran_Array2D<T> &Fortran_Array2D<T>::inject(const Fortran_Array2D &A) {
  if (m_ == A.m_ && n_ == A.n_)
    copy_(data_, A.data_, m_ * n_);

  return *this;
}

template <class T>
Fortran_Array2D<T> &Fortran_Array2D<T>::ref(const Fortran_Array2D<T> &A) {
  if (this != &A) {
    v_ = A.v_;
    m_ = A.m_;
    n_ = A.n_;
    data_ = A.data_;
  }
  return *this;
}

template <class T>
Fortran_Array2D<T> &Fortran_Array2D<T>::operator=(const Fortran_Array2D<T> &A) {
  return ref(A);
}

template <class T> inline int Fortran_Array2D<T>::dim1() const { return m_; }

template <class T> inline int Fortran_Array2D<T>::dim2() const { return n_; }

template <class T> Fortran_Array2D<T>::~Fortran_Array2D() {}

template <class T> inline int Fortran_Array2D<T>::ref_count() const {
  return v_.ref_count();
}

template <class T> void Fortran_Array2D<T>::set_(T *begin, T *end, const T &a) {
  for (T *p = begin; p < end; p++)
    *p = a;
}

template <class T> void Fortran_Array2D<T>::copy_(T *p, const T *q, int len) {
  T *end = p + len;
  while (p < end)
    *p++ = *q++;
}

} /* namespace TNT */

#endif
/* TNT_FORTRAN_ARRAY2D_H */
